io_uring: always go for cancellation spin on exec

Always try to do cancellation in __io_uring_task_cancel() at least once,
so it actually goes and cleans its sqpoll tasks (i.e. via
io_sqpoll_cancel_sync()), otherwise sqpoll task may submit new requests
after cancellation and it's racy for many reasons.

Fixes: 521d6a737a31c ("io_uring: cancel sqpoll via task_work")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0a21bd6d794bb1629bc906dd57a57b2c2985a8ac.1616839147.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1949b80..a4a944d 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9002,6 +9002,8 @@ void __io_uring_task_cancel(void)
 
        /* make sure overflow events are dropped */
        atomic_inc(&tctx->in_idle);
+       __io_uring_files_cancel(NULL);
+
        do {
                /* read completions before cancelations */
                inflight = tctx_inflight(tctx);